Classification of Scorpions. 307 
Sternum longer than wide, its sides parallel or slightly 
converging anteriorly. 
The penultimate tooth on the movable digit of the cheli- 
cere small, very rarely approaching the size of the terminal. 
Digits of the chele with their opposable edges angularly 
notched. 
Bases of the claws of the legs concealed laterally by lobate 
expansions of the extremity of the feet; feet furnished 
beneath with two subparallel series of strong spines (the 
anterior series sometimes obsolete, e. g. Miwphonus). 
Pectines of medium length. 
Tail powerful or moderately so, without a spine beneath 
the aculeus. 
_ In the male the tail and chele are often elongate, the 
hands being thinner than in the female; the digits, however, 
do not appear to be lobate and sinuate basally as in many 
other scorpions. 
Genera: Scorpio, Linn.; Heterometrus, Hempr. & Ehrenb.; 
Miephonus, Thor. (syn. Mossamedes, Sim.) ; Cico- 
petrus, nom. nov.*, Opisthophthalmus, C. Koch; 
Palamneus, Thor. 
Distribution. Ethiopian and Oriental Regions. 
Subfamily Zscuwvrzryt. 
Resembling the Scorpionini, but differing in having :— 
The feet not distally lobate and not armed beneath in the 
same way. 
The penultimate fang of the chelicere subequal to the 
terminal. 
The sternum very wide, with parallel or diverging sides. 
The pectines usually shorter. 
The tail weaker and distinctly compressed. 
Characters of male as in the Scorpionini, except that the 
digits are generally lobate and sinuate at the base. 
Genera: IJschnurus, Gervais ; Opisthacanthus, Peters; 
Opisthocentrus, nov.; Cheloctonus, Pocock; Chiro- 
machus, nov.; Hormurus, Vhorell; Lomachus, nov. 
Distribution. Ethiopian, Oriental, Australian, and North 
Neotropical Regions. 
Subfamily Drezocewrert. 
Differs from the Scorpionini in having :— 
A distinct tubercle beneath the aculeus of the tail. 
* For Petrooicus, Karsch, preoccupied as Petrovea (Petraca) in Aves. 
